Merge Dev

[arjunsuresh]

✅ PR Checklist

• Target branch is dev

📌 Note: PRs must be raised against dev. Do not commit directly to main.

✅ Testing & CI

• Have tested the changes in my local environment, else have properly conveyed in the PR description
• The change includes a GitHub Action to test the script(if it is possible to be added).
• No existing GitHub Actions are failing because of this change.

📚 Documentation

• README or help docs are updated for new features or changes.
• CLI help messages are meaningful and complete.

📁 File Hygiene & Output Handling

• No unintended files (e.g., logs, cache, temp files, pycache, output folders) are committed.

🛡️ Safety & Security

• No secrets or credentials are committed.
• Paths, shell commands, and environment handling are safe and portable.

🙌 Contribution Hygiene

• PR title and description are concise and clearly state the purpose of the change.
• Related issues (if any) are properly referenced using Fixes # or Closes #.
• All reviewer feedback has been addressed.

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[github-actions]

🤖 AI PR Review Summary\n\nThis PR adds a new 'reindex' command to the mlc Action class to allow explicit reindexing of scripts, caches, experiments, or all targets. It enhances the Index class to better handle index rebuilding, including removal of deleted items and improved modified time tracking. New tests are added to the CI workflow to verify reindexing behavior and index consistency after manual deletion of indexed items. The changes improve index robustness and provide explicit control over reindexing. Risks include potential performance impact due to full index rebuilds on reindex commands and the partial implementation of per-target reindexing (currently all targets are rebuilt regardless of target). The index rebuild logic is complex and may require further testing to ensure no regressions in index consistency.